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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd606ee07551190446b7fe5ca9da6f03a90f8b17d9386520a03e989595d4fe6a7' 
  AND token = 'Z62LHT/FehZM8ia8pxlS6MeCxET2aTYZJy/EGcr+bNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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