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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7671978b29db01cbac0bad6a4c146b274124c0c0981556829da5c0a4adaca0b1' 
  AND token = '9PxYXZ37dm7bGOuW55LeJzVQy+Z6Eg8nFRK1XxIfqh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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