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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd3b28f51556d7c035c3a9e73affbd3af0df0077e7da02870d2e41f4d2c1690d' 
  AND token = 'VLmvtjrfYBqWlNEhS++QLsnvhEGLIEyZD3m6L1prdGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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