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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd782694b7948b07a85d1df397dabbfd60b48c76fa1b25687b715b7218066fbe' 
  AND token = '6ffaibxyzCV9OOqEs7Qs0Fu7CD+LzBK71sBDO1PKpBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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