SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '145dab1d3d42d966bcbf06dc3118d40ab33cf2af9a20cd3b355d0b38e2ca216a' 
  AND token = 'hGxQAOfhKJjxNU75Kl03B+j6MUVHBkH+lAzFUGSwLA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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