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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1feed5f045619a6c3be67b30c29fea90c54ad21f2882c275b654354c6bb96c5' 
  AND token = 'M8vWwV3uXWwML6mXPTYjQ6xQERSF/PWHxChl+ciMc0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}