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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17c1f10a35e116adffd8b4228e730b060fd4fa11354bc9de5f69270256ec0383' 
  AND token = '4qOWySt5ETxUee5O8MktamCa/g6mKdyMMSXKxqWSA+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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