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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7cb5bff61c03659d49b5cd7c6a5bdf3ae73d59c7b950dfe9a9a61cf3ff0cf1c' 
  AND token = 'nAyq22JCWzIviYzH3Kk6k2laPmlfXPD1RvT7v5wUWY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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