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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf589690135f0498c8d0a414a4cd749fe994fd497c753a6b88010ff84617eea1' 
  AND token = 'z/8pG6EJB7e56zVi0DRQ/CAn/l3Vo1iJ2ftvzsgzKa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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