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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e790db5ba923cdd7d1c3f58a6458632d8572a836aff5c14419705377d5c42f89' 
  AND token = 'Hk2LcuV425BWmB9WiG7I8n8oPKFpB9mywNyiiB3D8KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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