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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e6d7bffef3f63345f1b3d43956650249100bf23fe5ed0977fa720c89dc45f53' 
  AND token = 'CH5MfLQjGQvbvupEQSUijRzr7e4k76NRnxiFHqi8hXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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