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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '872d097de0184620536455218de6fd19fab1cf2aefa83d0f1e61c4df156b1459' 
  AND token = '35SiETNzb7tZ4GvvxKl08rIHJ1aTBsQTfuQop+k1Sus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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