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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1af55031cb1d28851f6273f582799bd7fb24fc4899a0203870ca566e92f3dde0' 
  AND token = 'k59M8LupUYohSRbGGUr7I2Z1qPgMs+44m9I3M7LQX5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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