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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67e4de3a72d263ff9ce56e69efd6c15ac9b9de30de8363491410010d4b98522' 
  AND token = 'yL1FBuN4bvn/RquLTzP5kyt9JZJUD5bOjKFOEsXxnSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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