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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47df6528c3ee1224c9ccc11916365ca8b0aa767276ca92504eb3bf89beead30d' 
  AND token = 'mWZwEjaTiPpnQa6CH+NVYp3DhTMi9p+McS6wSViizxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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