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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fc866cc0cb0ce2b7e34aa656a476162bba6bf804c443a183c719dbeaebb585' 
  AND token = 's3OiuttOVrvyKhNphDoGnHk6hZMXjz2N/T0QsxMJZu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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