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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '860889c7d97a91fb2708a57b987a1235747ccbf1a405035a9ceeeae71350af23' 
  AND token = '4lzVTTY4MNn/Oq/an+QStCKRQAIMm1m7sHfzX95s1SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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