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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a84178c2b39f024a99de0a14e99417ec4eb7a341fce25d1dc5706495d4fd8d9' 
  AND token = 'rU4FqCtQorTfxhYZhWhMs7CKfjjihfy9HeIu0EHUIVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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