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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96828bd0b802af73a1632b7c2ac902b05b472f0ad132654b07ef8cebf1a3ca36' 
  AND token = 'q9eD/74Ei4VpJi82j0H4PuDGuVczBdeHNuBKG9wAfmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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