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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd530cbe0e064f094995de1e44e05b6184f822079f647e3bca144e5084fefff3b' 
  AND token = 'vEIcK6lwLpDudme1Zv/yxVrdTLa7o1eUCqW1CUURQF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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