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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b8227590d5d4b5e1f91eafee4a3085ede00dd856ed174eaddbac13fd392426' 
  AND token = 'VkWW/abJHT0AhJRLi5E6iZF9b8o91eN1nV9JA50JGzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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