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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca565a9248bc973d3246d2a8a3e02c0ca54ddf7891f1a874663bc2595b5cf9cb' 
  AND token = 'hwBtWe0O+7Reas2RnRQzry63igdhD91W1Z7jwhjyfLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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