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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1018bde2767313b3f3b991745e693b81c5eec5ecd56a6a135bf511eaf5efd962' 
  AND token = '+8VUY4bCUje8geRGDYI0nW8iKASpNDtwMxGjN13ZcB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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