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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c845113ee359261c09c4029fec1af8606a54b0b9b86ceb87312cf5a31d3147e' 
  AND token = 'uR3pW0StO9WsxQEF40keERrDQaHRrXQgB8Y/8lGmiI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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