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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b9a23d029cdae7a4c2d63a7694470c2f3060c58309e3347d0564e87a635560' 
  AND token = 'bgwwwLC29+zSc0zgzUEJuwTm3y5hHlmHIBaqzbIurVY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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