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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30af34aea9a58c76b736896edf8a60627feacb005ccea0236cd404b62916577f' 
  AND token = 'pxe2TPXb3xh9wPJBA5wm8fp/BvHIEwBj1r/UopuBlV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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