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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7ae6f045562ed034799bf13c34b53c90b04a8f6363e52a06cf4ac9db4ebab61' 
  AND token = 's7mfo9P9UG/XS6AP+/uOoSxTBkodylmmzuYvUonMp+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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