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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9314fcdf1d44a40081033b4bd25c5df5792a09491717e63efb4b6d26cb6f2b11' 
  AND token = '3uExgh3jIpIPuDppTcbpyXnqd3J7FZBoEclJE74J+p4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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