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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb072deea7c4fbdd784fa4f12d9cc5823167ce917846a612ed956940835ae60' 
  AND token = 'LYGqA8XIPQa8YQDT/H6iyed4VcArf/EIuscI7lwaj6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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