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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1171e4b073e62e5fd748b94aee78b01e52f0cf7f4c28711b47c562115b48513f' 
  AND token = 'kq5P+QZrFTvCRDGeP4hfD4XKJKac7cu6FmsChcAaKgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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