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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a56133759fb28c5b590ac8b41e90c80d3c9fafff7ca61efdec52e31c9698dc' 
  AND token = 'Skt226Lws58KKv7Sbaj8wvbL5ZM7YL5Iqh11nrqv064=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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