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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f6bd903aa26da3cd75a91f11b8327df1236d5c02424cf39539822b0c3b692ef' 
  AND token = 'a92OeaTPUEgin+VYXlx7TEmuh3hhqX8y+qogPfehGf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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