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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09d0849b4cbc5edf59fb5ceb4f2816ba5d74efaf543c2ff33c23c952f65eb18' 
  AND token = 'uSy+MImoJWLExMabus5qlq6v81TeDRjAyUJjSpK4jNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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