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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2227de3d63230e278cb18dd2ba7dab3805afdb71f50a3a4a965d39573f82177a' 
  AND token = 'rDGCGw0jaMJZdajSICrpb8bpZAEme1Eeo7irDypbfPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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