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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9bd29033b60fe73194edf4c55e42b47d580143a379a64a9441b0d933884b18c' 
  AND token = 'bolcAKUKru4xv2aCZZk04D60Kcnc7Tjsj7uDqVbc9xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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