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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9a4b47cd5c90f6c802f192ae7b657c7f52308223f24b1a0d4a16b29ef65ca92' 
  AND token = 'AFiHFuR4VgVn2xe2cxkjknh7BIDLNVtt4y8ZpLdrT3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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