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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e3818bc0ba98b9d02f51e0507df90a853fec479ecf2929f6202ff58b8b694f' 
  AND token = '7Uccm9qlAQ2I2ksEWy8E8BKrtT+IZ1QbmiMyOQ6+7bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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