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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce0ec4762b61526cac39757d248dc5fc23ebca8d89be822843cf03d200d5183d' 
  AND token = 'F3sEuZGNVHbhOfnXlPhbWCACq1Efzxc3JGaeSSlDxrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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