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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bba093b83fbe84cfa121228502d755a75be352cc11e28ad4a5e7e92221c39cd9' 
  AND token = 'MSWjtcuq5K2DiCu+HKV47FtDVzUXtb/SK8dLoauk8uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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