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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb51ca9dc84b2b413a3a04ea391a8d5a934ba3f41486630eeee1a7fc5bf109bb' 
  AND token = 'OYc0ALf9O+ZEVgJqweFNWma5hs0o9D/L9ft6ajMVqKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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