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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cb4774e676625e775c65f63ce0eb0f09ed17e5614f51f32920cdf1b7025dabd' 
  AND token = '8KQkwrPbUapaYzs5DIkXf+IF3Fqmx7864iyl7E1QJFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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