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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '832a2a6ffb6bcb0e68b5ff05d016c0a295d95261cdfb6156b0a564b991874625' 
  AND token = '66emLkPHhLL9Mt4oqGQcuK8GKQxhMFC6wyq90/uylyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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