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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8d8de94c934b35a46ec766dfc7794614f7dcf8bbf44479c48e01e28a636c10' 
  AND token = '1bR54mpJnaslBkJIPPILXGwOg4iEHqJWA2MGQ6EpjsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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