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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0ee03a571bd087ba7a94d3999b388d04d225970a706004da9c20ebf27b7a213' 
  AND token = 'PJOfmPJeUnHQhJvb7/j5Q3dSUgGHdCFU7n4fuI7Ie0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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