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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b89dbdc17c6f3475c3aa0e54bc39ac1258e42dce2cb236b81c240f85355dc9' 
  AND token = '3wrBwobSbhDYi1MZ6ibZSK0BTL3Dlsx/Xr1w2TJHm3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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