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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3004e12df126695c7e8c73c388db595b2d16262864eac7cebb0250a8e38f76a0' 
  AND token = 'yAGafU7s8pn8uwNYGipl2wxSEAo1AEp7Ek3iJIH5FNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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