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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ec75344701dfbfbd6b9141b8abb5b92b193cb3ab32b90374cba498f53a84781' 
  AND token = 'iWsHZ0E9L5fFD45imBk9VBmi8aSc7R1UrpYOChCIKHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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