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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01bea88244fe2d2c494b804d679ad6c32a3310904c67720e73588c247b5437f1' 
  AND token = 'kTAdfqKLoLuWGbo6We+zFoad3H4W8374VdgSZkncHy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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