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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11b77a565ba803ba6681a0425686794bfe343099e3ac191fd75a3f4e105aaf5a' 
  AND token = 'kL8Q9AXwqNniYlSMwr3SwzxDoSF7Dxp83JQldb/2suM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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