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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c84e7e727dfd8dd04978a7eb1d75a7a29477a383d0c1ca24d93f0e049e774511' 
  AND token = '9ZvESIyQBNogR+yxFjai7eKqXB7GdgK/alKMXsI+fps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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