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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a229141d18572e742e3291cd7f71abd3b2958e3cd88c72fdc852a9a4b1fbae86' 
  AND token = 'm0DH6ToXXezDckhek0atxgWyHrLW9aIHGoWxbHnAVQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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