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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '488e3c1990bb4c553af81a4f0d37ed1f471f0cfd72e7476876ac9f9ab583731d' 
  AND token = '/oCFdKvaD264uvMD3R9zfPM2SxZ+gF2uC4UKzye2fYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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