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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0a872da69f95a2e2e614bc7047edb737b4307e2859260ea830d61d03179980' 
  AND token = 'n5deXwF1Sv20QOL8BZODFNyfuO05xFhIaXp0kbVcNcU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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