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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e7df8140c276e2e37f2e96b73b96e085d4e5fa03942606f904fc66d9a8987de' 
  AND token = 'Ps6bQ2+wMqbufW/8wckPrMDMn3YdCg6XYl3GCVLKcKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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